522666661 has 4 divisors (see below), whose sum is σ = 570181824. Its totient is φ = 475151500.

The previous prime is 522666653. The next prime is 522666673. The reversal of 522666661 is 166666225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 522666661 - 2³ = 522666653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522666601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23757565 + ... + 23757586.

It is an arithmetic number, because the mean of its divisors is an integer number (142545456).

Almost surely, 2^522666661 is an apocalyptic number.

It is an amenable number.

522666661 is a deficient number, since it is larger than the sum of its proper divisors (47515163).

522666661 is a wasteful number, since it uses less digits than its factorization.

522666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47515162.

The product of its digits is 155520, while the sum is 40.

The square root of 522666661 is about 22861.9041420438. The cubic root of 522666661 is about 805.5174128196.

The spelling of 522666661 in words is "five hundred twenty-two million, six hundred sixty-six thousand, six hundred sixty-one".